Where does “cu” come from?

cu (Welsh) comes from Middle Welsh ku, from Proto-Brythonic kʉβ̃, from Proto-Celtic koimos, from Proto-Indo-European ḱóymos, from Proto-Indo-European ḱey- — to be lying down; to settle.

cu (Welsh): dear, beloved

Definitions

dear, beloved

Ancestry of “cu”, step by step

Step	Language	Word	Meaning
1	Middle Welsh	ku	—
2	Proto-Brythonic	kʉβ̃	dear, nice
3	Proto-Celtic	koimos	dear, nice
4	Proto-Indo-European	ḱóymos	of the home, belonging to the family; village,...
5	Proto-Indo-European	ḱey-	to be lying down; to settle

Words derived from “cu”

cuedd
mam-gu
tad-cu
amguedd
mamgu
amgueddfa

Every word from Proto-Indo-European ḱey- →Every word from Proto-Indo-European ḱóymos →Every word from Proto-Celtic koimos →